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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa28f4df59c5c4d44443c09d1c62ba81279b85289a5b42d3d924f85e9322d4ec' 
  AND token = 'HIVv55dbVH35nWk8ysnVA1aEgqVTbCBFEd0AyrYUDUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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