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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f631221a0b79d1f6aadbedef230ec60428073f90c839ee64cac4c35ceac4b26a' 
  AND token = 'sUHpl2cAn8oqHTAYOgWFZ8ETK0JQZcjdxjUhW0cLB2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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