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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2625f3852a809b671523959e851c5fd50ad1a7f8e8e9d20b695231bfe74dd9e7' 
  AND token = 'NP2YCjKcEDsKXPGGoOAT9PmJQIGodqHF8DfgnktiIvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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