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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe779d951495cf3829deb4527b053c4408cef8c74c321d672dff86fc1c8ddd3b' 
  AND token = 'rQqvBpzFgRO1M0Z310S2ZS/dB0xtHvm6B8spDOHILUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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