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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907c473d8ffe847420b9d5da60cf414a5b125cef39859a68d448a2209541bd31' 
  AND token = 'mf7ER6INv/iJ2k4ZGMA9beitUo6RsliN0PqtonYpshs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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