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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4550b63c1d0b38cafb1d4e3337a0dbbc1bf7b9a96e612c42c6e5f11deb10feac' 
  AND token = 'MjWu/0aPX8aDDWX+xI2F6yP+Cba5XTw5H4FBU9rBH+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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