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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42532193242ea10ca7bdb81066ba15459d0daa33904654d3b103dc01c8e8b7a4' 
  AND token = '0fa6jHl2bri7fleGeLGB6UrXL/21MfvMMT4bWgmsxuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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