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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bb8257447786902da5f7fc5caa1f12390eeb818c9f729d20cec4b1c2f34c8e' 
  AND token = '41auPpyQHGd7lp3WgwFP9mHeltS/VcD5I75ZxedVRlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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