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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d7e06432ed769a1a5c5ae0692543ebdc018e22b1d5612d627dc33423df73b2' 
  AND token = 'J6HNAHdBUeFcaRyKdDe4n8CAOd+PRoD9WEe8dulQer8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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