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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ed0809666a5dfbfebe455539a6f033915a2df8cdbf36960b66b7e4e5d83c01' 
  AND token = 'fv/M97BeK2nQzQObrMvy/FQwSi9huBIRd49BAkxDH7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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