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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f6b29efbfb4037d23867ee66f4e0ca5c0434b1a48e9878dacf2618dc70bdb5' 
  AND token = '9LEwSW3cL7pewo0AnljGYPxcFKmgUneaFkMuy7o6Vn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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