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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ae1f3f4074ae34f01029ecb2fe04262f1dbc77b21a80eb38e65e42c0c722d0' 
  AND token = 'wLFBDahY1fhWLbTTo9U8caqzxXTHuFkNHEwLyWmSFmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}