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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da60627f4bbc715a58954c866584e55a33f8d67bfc3efb8e4d2ea6c2b9d0238' 
  AND token = 'M03qbGQ4AobLdHnoREBVQz4nM1GP4U3C42ljrEi+Oo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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