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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbb51f063f2156573076b0268e432a0ac49ed84ff875c65dc33ec6a20fdc0e4' 
  AND token = 'b1niuJrjnIVMZElRYn0ULrowJkkH9pfmqDBgyhdc51M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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