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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e341a87665ae77ae228c24ab1239b6f330783bc790c877928e787b8fc1f09c46' 
  AND token = 'EJMAQQsrfCeyXh11KJTu3KG5n8FWTZMP4zdLM3GlcmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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