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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6910d2ef21b68755a469e2b5f8242d32f5e0d1ef69a936ddc15cbf508b9016b' 
  AND token = 'YhjU3srJ1vd7z3riAmNSmInZyfocH7zC84V9Xh9UfP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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