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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fedd061ac6ef8e7a4756dfdcbe1c49b9c310dba74d526b4eee0fca959311f2' 
  AND token = 'mKPqw3iyZymo/wxKYhpv7fr2q7fhu1uLk7AhXRzlnKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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