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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ece6b81deb5548e636580b9e45bf5f9122755bf60965e2450a81ed44da66c8' 
  AND token = '5ra5MB18dJL9DKejSFJrZUoFvSNQAA/JA/lHqqTdbwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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