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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c696f26cb3edb1825a9588f6caae1f50c11d6452464ec871fd521456bd29ef8' 
  AND token = 'hsrC/jDXbuq4cg5gcgvKnnEIO6PN9pWqcA65naV5cVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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