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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2db6374cbf0b9d6b874b6f4d20ef74ae44ce9803a39f647e65075bdae797b7' 
  AND token = 's/IuUI09m77KxvpsDs/PZA8pJcpn2SI7wNL4c88lPB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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