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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe44dba63488e1b304fe7bc046762777f37673953c9ea9630721feb7d3ee8e1' 
  AND token = 'J/QCnYapG/+PSYv0zfxvU0TTZXbM6PXnXgpp//oz/fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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