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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8510abfe3adc1da0de0ec60b281e12625e649fb124f063e4273f1c92e480f3a0' 
  AND token = 'xHHytF8SNNOfFGcu0onaDrIC7fyvenOEp9c8FFzJJSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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