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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4319550ed4df687924da2ddefc87d63ca44afb66deb0f829426397fe5ca7e58' 
  AND token = 'P7wbiXu69peDxKbefLiM5PJj3hC6/FYilx88wwsnhrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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