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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed003b00af1de60c530f6c273e90c8d9cc18259bd766be745a26502cd30c4ffd' 
  AND token = 'X6EDIyuBK3dcVHudOIEHSB8iOG4Htomogq28fER74QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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