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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b43e114d02f77bc22bc3a2cbb0474ae8b40facdd093e7eabfd3fe4956cd76a0' 
  AND token = '4QzEG7eQ0nv3t5SCBIA/itV79ePwmzB0RI7BzNIEArI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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