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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8fce83b9aae8167a72057a0e502adbcc651c8ec69f255aeb8d846bf0bee372' 
  AND token = 'LRDp4FgiFbeovCbh6y9vK5HvC+Q1sVdUgAkI5P6P6eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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