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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640bfffef3e25d5577ae72e14fe8097651b8da5a084cbd83b1145b0f506643a3' 
  AND token = 'W0jXf38juohkiPahkULBUfxnov8GUKAKhv8fH+/T2nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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