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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ebcb80f6e4b9ff870667f251c536876041e2a7152cb7cacbcc88c104686573' 
  AND token = 'zNfct0qHFt0imst8CrkR0nAtF5ZPKHRLQb728GzQZwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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