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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf03d0be9bc759c6d3065449e79138e3328d200fb844fe403f0c098e464f04d' 
  AND token = 'xUuqHB/ocz1Fmxd/ZSfr0+t9ZKYSFWozBOEZjw4qavQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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