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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09ae2db55603de917daf6bf813007b80c4eb571994444884f3af13b0a4c7adc' 
  AND token = 'zUJGAF/in/YyTFamxIhFRbSPt1Sk1uhe5q06nCRFWLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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