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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2f5173f36f228045b589862f9737a4c09510b7d1078aac4cb5788cec8698c3' 
  AND token = 'NiY/ybfpgbtint2QUD2qEkDuzIEuQgtevGvB/gIb3J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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