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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdfbc8ad20e34187d7b7cad9e7e7870e0097454956e6b44caee77da78ff831d' 
  AND token = 'ANb5B77GUMQINNL6L1DWsD3TZqXi2QUOcchrTDZnLU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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