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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2dcaaf0b7992684fb236c27e7dc6dc0103289aac02d26e786b6e40092fda861' 
  AND token = '5wKEaDlSyMCyVvD4hozg5Wl32S94hR7AmiEE+2Dmmd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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