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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c40703f9c22f31b1ec3fadc30a580ca552b50efadaa4f77709967424bae51e' 
  AND token = 'yx5hq4MikyV4eZMyK88b7E3lR4Jh8VdZmLh5dWcNW2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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