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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96f3f8d9cdaf06d498b058c6d3927b36f1ae23e83e92b92fa9bbab11cca7a06' 
  AND token = 'I2wWw+P6xh7a977X3fI4xn337hExzw4Nx/cLxjlprJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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