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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54877038bc5b40b1e0bb6e781eed009fadcfaa2fce9d880353ceb21b85c8fa41' 
  AND token = '1BlP9+f6gGiiLO8ah8oXYCMWNwV4Cu1RtHribbLqyp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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