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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb756faf37caa15d251cdf6fa8b9c9703c1d134d9c30ad7aaaf96f854911036' 
  AND token = 'ZpJMicVIMMMX0SM4LTsITCvaE4hYesFa0og96uzkykc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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