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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77838c24fb0155b7717002d7bb0c55bf949b82e70aecee9c30783b12f716894d' 
  AND token = 'MvUAXbQ+1lNkXDY60pSarOdkW/UyqY+NF3gpbeKJL/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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