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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8ea9f7835a46382d259799cbe57e1ae1e309d0459b64ff77ca2480dd20ec5d' 
  AND token = '7AH4otuZTLKfVbMl+8TJWpJUaabD3jZagN6a93NfLLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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