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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40316d747cb94b25d532b4ece4a0a65de0e83646979f66f3181120cbc88e5887' 
  AND token = 'FbHBOEJZhmJ0oAex885BvyELTf0o0l1T6RLAARRu4kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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