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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0623fba7a2813825d060590da0fe128de1af8c17e912211e8ee32bfa59c78599' 
  AND token = 'q7qtx/jFJu9G/CxrKHQaRr9+yOivcJrArRDVX6jXfF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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