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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e1ff5cd7f48c1db37232527890eb86913e38fc9e4bd0901848f9e816a1d57d' 
  AND token = 'pKxz4sb+QHT0ync4v/J01K4Bs/tce7qdwHowXlt7pMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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