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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3de5907a8d6e719d1161c17ef404f3d500def16390e2d51a0f7f34341c2b36' 
  AND token = 'qyY/o0J73aFy3fC/mgFPQ91H3flw8fjkweL0FIyZPgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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