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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3433df0fcdfef61e13333359ba697f07bf5450241c1b884781c770ae6e21b33' 
  AND token = '4GpdhZUkd0Ec317/pHJxG41OMDC5/6NKK17dsnfyPCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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