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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e900be7251f0ce3989b0edcf1595935a2da9b6311e07ac4eab530a0b843216c' 
  AND token = 'rnVTMNAyDlVWZ8x5mgOfmHqWo1M7pNP19xGQMISvou8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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