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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fa28a015bc2a2b0bac8976401d36ef94fa7e35f98383b7b18d90364920c905' 
  AND token = '/8tnrbUUW9dJJlhmLNFxt7ltato0Q6UeFv/2y8jKCKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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