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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d17eca67104f844cccea6051dc0a687f4c6ecc0d7e61df4a7baaebc20beeaf' 
  AND token = '6cm3jwHWTA444Jp6vk+NrZvgi3ThQNT+ay1qeiUrJjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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