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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e765281dc85a33443241a59823e14cce86f09302e7c5e1035d1330ebe8dd687' 
  AND token = 'rJZBMtCTUIGBBqaEpNSte7kA1XAa296BgvnhqV9Epgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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