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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75cc7047428b3c4b1ef808633c18d62b98644ca8860c5fca3f878599620167ae' 
  AND token = 'L5lg8/ANTMYK7C/R+j2inGpjNH9GSDxwiMAUT9eCbfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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