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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458746e4523f5328dd7ba22cb77a131362da16554aa444d66270788c23fc7007' 
  AND token = 'AeJuMzPiws6Nhrh05WCJCXrhZYaB89H8JbNghu5bnLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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