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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d34908109d8d0e6180f3d3d2bea233a2b4f90ebdbe18d6c4738a7a36846e89d' 
  AND token = 'TzklvJo/iMZ47oOxvSJb95Pf9oofk1/qPhkIoDJh1Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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